Abstract
Molecular sieve properties of general-purpose carbon fibres (GPCFs) from different origins are studied. Selectivity of the materials for CO 2 and CH 4 separation and uptake of these gases are analysed and compared with a commercial pelleted carbon molecular sieve appropriate for this process. A set of four GPCFs, one of them commercially available, obtained from petroleum or coal tar pitches is used in this work. Kinetics of CO 2 and CH 4 uptake at different pressures and temperatures have been followed. The results obtained show that the GPCFs have a high selectivity to CO 2, the kinetics of the process being very slow. The treatments, which comprise either the elimination of surface oxygen groups or controlled gasification, produce materials with a high selectivity and CO 2 uptake and fast kinetics. In this sense, the general-purpose carbon fibres can have a performance as good as a commercial carbon molecular sieve.
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